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How many times do you need to ejaculate to avoid becoming pregnant?

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  • Retired account

    I have a question. Is ejaculating only three times after having a vasectomy sufficient enough to be given the all clear to have unprotected sex?

    Dr. Edward Karpman

    Three ejaculates after a vasectomy are usually insufficient to clear all of the sperm from the reproductive tract downstream from the vasectomy site. The disappearance of sperm is seen in a logarithmic curve and can last for up to 24 ejaculates. The only definitive way to determine if sperm are still present after a vasectomy is to obtain a semen analysis. All patients are advised to continue using some type of alternate birth control until it has been confirmed that there are no more sperm present.

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